Friction brake system for a vehicle

Abstract

The present application relates to a friction brake system () for a vehicle. The friction brake system () comprises a braking member () connectable to first and second brake pads and configured for pressing the first and second brake pads against a friction surface. The system () further comprises a transmission unit () configured for converting a rotary motion generated by an electric motor () into a braking motion of the braking member (). The transmission unit () comprises a ball-in-ramp assembly () having a first plate () with at least one groove (), a second plate () with at least one groove () facing the groove () of the first plate (), and at least one ball () arranged between the first plate () and the second plate (). The ball () is retained by the groove () of the first plate () and the groove () of the second plate (). Further, the ball-in-ramp () assembly is configured to convert a rotary motion of the first plate () into a translational motion of the second plate () with respect to the first plate (). The first plate () is configured to be rotated by the electric motor (). Further, at least one of the first plate () and the second plate () is mechanically coupled with the braking member (). The first plate () is rotatably supported by a brake bolt bracket () coupled to a braking bolt (), and the second plate () is operably connected to a caliper housing bolt () connected with a caliper housing () such that the caliper housing () and the braking bolt () are configured to press the first and second brake pads against opposing surfaces of a brake disc when the braking member () executes the braking motion.